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Seamless Medium-Carbon Steel Boiler Tubes from China Suppliers | High-Quality Factory Products
Ordering Information
Orders must specify:
- Quantity (length/number of tubes)
- Material grade (A-1 or C)
- Dimensions (outer diameter, wall thickness)
- Length (specific or random)
- Optional requirements (e.g., hydrostatic testing, non-destructive testing, certification)
Materials and Manufacture
- Steel-making Process: Open-hearth, electric furnace, or basic oxygen process.
- Heat Treatment: Tubes must be heat-treated (annealing, normalizing, or stress relieving).
Chemical Composition
| Element | Grade A-1 (%) | Grade C (%) |
|---|---|---|
| Carbon | 0.27 max | 0.35 max |
| Manganese | 0.29–1.06 | 0.29–1.06 |
| Phosphorus | 0.035 max | 0.035 max |
| Sulfur | 0.035 max | 0.035 max |
| Silicon | ≥0.10 | ≥0.10 |
Mechanical Properties
| Property | Grade A-1 | Grade C |
|---|---|---|
| Tensile Strength (min) | 415 MPa (60,000 psi) | 485 MPa (70,000 psi) |
| Yield Strength (min) | 255 MPa (37,000 psi) | 275 MPa (40,000 psi) |
| Elongation (min) | ≥30% (2 in.) | ≥30% (2 in.) |
Test Requirements
- Tensile Test: One test per lot (50 tubes max).
- Flattening Test: For tubes < 2⅜ in. (60.3 mm) OD.
- Hydrostatic or NDT: Each tube must undergo hydrostatic testing or non-destructive electric testing.
- Hardness Test: Optional, if specified.
Inspection & Certification
- Manufacturer must provide certification of compliance.
- Third-party inspection may be required if specified.
Marking
Tubes must be marked with:
- Manufacturer's name or trademark
- Specification number (A210/A210M)
- Grade (A-1 or C)
- Heat number
- Size
Keywords
Seamless steel tubes, boiler tubes, super-heater tubes, medium-carbon steel, pressure applications.
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❓ Frequently Asked Questions (FAQ)
Q
What is ASTM A210/A210M and what is it used for?
ASTM A210/A210M is a standard specification for seamless medium-carbon steel boiler and superheater tubes. It is primarily used in high-pressure and high-temperature applications such as boilers, heat exchangers, and superheaters in power generation and industrial plants.
Q
What are the differences between Grade A-1 and Grade C?
Grade A-1 has a lower carbon content (0.27% max) and lower tensile strength (415 MPa min), while Grade C allows a higher carbon content (0.35% max) and requires a higher tensile strength (485 MPa min). Grade C is suitable for more demanding pressure applications.
Q
What heat treatment is required for ASTM A210 tubes?
All ASTM A210 tubes must be heat-treated after forming. Acceptable heat treatment methods include annealing, normalizing, or stress relieving, depending on the grade and application requirements.
Q
What testing is required for each tube under ASTM A210?
Each tube must pass either hydrostatic testing or non-destructive electric testing (NDT). Additionally, tensile tests are required per lot (max 50 tubes), and flattening tests apply to tubes with an OD less than 2⅜ in. (60.3 mm). Hardness testing is optional if specified by the purchaser.
Q
What information must be included when ordering ASTM A210 tubes?
When placing an order, you must specify the quantity, material grade (A-1 or C), outer diameter, wall thickness, length (specific or random), and any optional requirements such as hydrostatic testing, non-destructive testing, or third-party certification.
Q
What markings are required on ASTM A210 tubes?
Each tube must be clearly marked with the manufacturer's name or trademark, the specification number (A210/A210M), the grade (A-1 or C), the heat number, and the tube size. These markings ensure full traceability and compliance verification.